Improves docs

test/streaming/report.sh

 #!/bin/bash
 
-# This script reads stdin.
+# This script reads stdin and expects the output of cvlc.
 # It is used by the run.sh script and receives the output of the cvlc client.
 # It counts the number of times the frame "dropping" error is seen and every 10 times it sends a message to telegraf reporting "another 10" errors.